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  <div class="section" id="isa">
<h1>ISA 纠删码插件<a class="headerlink" href="#isa" title="Permalink to this headline">¶</a></h1>
<p><em>isa</em> 插件封装了 <a class="reference external" href="https://01.org/intel%C2%AE-storage-acceleration-library-open-source-version/">ISA</a>
库。</p>
<div class="section" id="id2">
<h2>创建 isa 配置<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
<p>要新建 <em>isa</em> 纠删码配置：</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ceph</span> <span class="n">osd</span> <span class="n">erasure</span><span class="o">-</span><span class="n">code</span><span class="o">-</span><span class="n">profile</span> <span class="nb">set</span> <span class="p">{</span><span class="n">name</span><span class="p">}</span> \
     <span class="n">plugin</span><span class="o">=</span><span class="n">isa</span> \
     <span class="n">technique</span><span class="o">=</span><span class="p">{</span><span class="n">reed_sol_van</span><span class="o">|</span><span class="n">cauchy</span><span class="p">}</span> \
     <span class="p">[</span><span class="n">k</span><span class="o">=</span><span class="p">{</span><span class="n">data</span><span class="o">-</span><span class="n">chunks</span><span class="p">}]</span> \
     <span class="p">[</span><span class="n">m</span><span class="o">=</span><span class="p">{</span><span class="n">coding</span><span class="o">-</span><span class="n">chunks</span><span class="p">}]</span> \
     <span class="p">[</span><span class="n">crush</span><span class="o">-</span><span class="n">root</span><span class="o">=</span><span class="p">{</span><span class="n">root</span><span class="p">}]</span> \
     <span class="p">[</span><span class="n">crush</span><span class="o">-</span><span class="n">failure</span><span class="o">-</span><span class="n">domain</span><span class="o">=</span><span class="p">{</span><span class="n">bucket</span><span class="o">-</span><span class="nb">type</span><span class="p">}]</span> \
     <span class="p">[</span><span class="n">crush</span><span class="o">-</span><span class="n">device</span><span class="o">-</span><span class="n">class</span><span class="o">=</span><span class="p">{</span><span class="n">device</span><span class="o">-</span><span class="n">class</span><span class="p">}]</span> \
     <span class="p">[</span><span class="n">directory</span><span class="o">=</span><span class="p">{</span><span class="n">directory</span><span class="p">}]</span> \
     <span class="p">[</span><span class="o">--</span><span class="n">force</span><span class="p">]</span>
</pre></div>
</div>
<p>其中：</p>
<p><code class="docutils literal notranslate"><span class="pre">k={data</span> <span class="pre">chunks}</span></code></p>
<dl class="field-list simple">
<dt class="field-odd">描述</dt>
<dd class="field-odd"><p>各对象都被分割为<strong>数据块</strong>，分别存储于不同 OSD 。</p>
</dd>
<dt class="field-even">类型</dt>
<dd class="field-even"><p>Integer</p>
</dd>
<dt class="field-odd">是否必需</dt>
<dd class="field-odd"><p>No.</p>
</dd>
<dt class="field-even">默认值</dt>
<dd class="field-even"><p>7</p>
</dd>
</dl>
<p><code class="docutils literal notranslate"><span class="pre">m={coding-chunks}</span></code></p>
<dl class="field-list simple">
<dt class="field-odd">描述</dt>
<dd class="field-odd"><p>计算各对象的<strong>编码块</strong>、并存储于不同 OSD 。编码块的数量等同于在不丢数据的前提下允许同时失效的 OSD 数量。</p>
</dd>
<dt class="field-even">类型</dt>
<dd class="field-even"><p>Integer</p>
</dd>
<dt class="field-odd">是否必需</dt>
<dd class="field-odd"><p>No.</p>
</dd>
<dt class="field-even">默认值</dt>
<dd class="field-even"><p>3</p>
</dd>
</dl>
<p><code class="docutils literal notranslate"><span class="pre">technique={reed_sol_van|cauchy}</span></code></p>
<dl class="field-list simple">
<dt class="field-odd">描述</dt>
<dd class="field-odd"><p>ISA 插件包含两种 <a class="reference external" href="https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction">Reed Solomon </a> 编码形式。设置为 <em>reed_sol_van</em> 表示用 <a class="reference external" href="https://en.wikipedia.org/wiki/Vandermonde_matrix">Vandermonde</a> 算法，设置为 <em>cauchy</em> 表示用 <a class="reference external" href="https://en.wikipedia.org/wiki/Cauchy_matrix">Cauchy</a> 算法。</p>
</dd>
<dt class="field-even">类型</dt>
<dd class="field-even"><p>String</p>
</dd>
<dt class="field-odd">是否必需</dt>
<dd class="field-odd"><p>No.</p>
</dd>
<dt class="field-even">默认值</dt>
<dd class="field-even"><p>reed_sol_van</p>
</dd>
</dl>
<p><code class="docutils literal notranslate"><span class="pre">crush-root={root}</span></code></p>
<dl class="field-list simple">
<dt class="field-odd">描述</dt>
<dd class="field-odd"><p>CRUSH 规则（如 <strong>step take default</strong> ）第一步要用的
crush 桶的名字。</p>
</dd>
<dt class="field-even">类型</dt>
<dd class="field-even"><p>String</p>
</dd>
<dt class="field-odd">是否必需</dt>
<dd class="field-odd"><p>No.</p>
</dd>
<dt class="field-even">默认值</dt>
<dd class="field-even"><p>default</p>
</dd>
</dl>
<p><code class="docutils literal notranslate"><span class="pre">crush-failure-domain={bucket-type}</span></code></p>
<dl class="field-list simple">
<dt class="field-odd">描述</dt>
<dd class="field-odd"><p>确保两个编码块不会存在于同一故障域的桶中。比如，假设故障域是 <strong>host</strong> ，就不会有两个编码块存储到同一主机；此值用于在 CRUSH 规则中创建类似 <strong>step chooseleaf host</strong>
的步骤。</p>
</dd>
<dt class="field-even">类型</dt>
<dd class="field-even"><p>String</p>
</dd>
<dt class="field-odd">是否必需</dt>
<dd class="field-odd"><p>No.</p>
</dd>
<dt class="field-even">默认值</dt>
<dd class="field-even"><p>host</p>
</dd>
</dl>
<p><code class="docutils literal notranslate"><span class="pre">crush-device-class={device-class}</span></code></p>
<dl class="field-list simple">
<dt class="field-odd">描述</dt>
<dd class="field-odd"><p>使归置限于指定的设备类（比如 <code class="docutils literal notranslate"><span class="pre">ssd</span></code> 或 <code class="docutils literal notranslate"><span class="pre">hdd</span></code> ）之内，在 CRUSH 图里使用设备类的名字。</p>
</dd>
<dt class="field-even">类型</dt>
<dd class="field-even"><p>String</p>
</dd>
<dt class="field-odd">是否必需</dt>
<dd class="field-odd"><p>No.</p>
</dd>
<dt class="field-even">默认值</dt>
<dd class="field-even"><p></p></dd>
</dl>
<p><code class="docutils literal notranslate"><span class="pre">directory={directory}</span></code></p>
<dl class="field-list simple">
<dt class="field-odd">描述</dt>
<dd class="field-odd"><p>设置纠删码插件的路径，需是<strong>目录</strong>。</p>
</dd>
<dt class="field-even">类型</dt>
<dd class="field-even"><p>String</p>
</dd>
<dt class="field-odd">是否必需</dt>
<dd class="field-odd"><p>No.</p>
</dd>
<dt class="field-even">默认值</dt>
<dd class="field-even"><p>/usr/lib/ceph/erasure-code</p>
</dd>
</dl>
<p><code class="docutils literal notranslate"><span class="pre">--force</span></code></p>
<dl class="field-list simple">
<dt class="field-odd">描述</dt>
<dd class="field-odd"><p>覆盖同名配置。</p>
</dd>
<dt class="field-even">类型</dt>
<dd class="field-even"><p>String</p>
</dd>
<dt class="field-odd">是否必需</dt>
<dd class="field-odd"><p>No.</p>
</dd>
</dl>
</div>
</div>



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